Electric ice crusher



Aprrii M, W67 R. J. SCOTT ETAL ELECTRIC ICE CRUSHER 4 Sheets-Sheet 2 Filed Jan. 9, 1964 INVENTORS. Robe/f J. .5007?- W/V/M/W 6. /zappefl BY Jack E. Ema/ A rrifi H, 3%? R. J. SCOTT ETAL 3,313,493

ELECTRIC ICE CRUSHER Filed Jan. 9, 1964 4 Sheets-Sheet 5 IIII I 20 "'Hm/ U2 47c wi ifiw a 4v Ap 1967 R. J. SCOTT ETAL ELECTRIC ICE CRUSHER 4 Sheets-Sheet 4 Filed Jan. 9, l964 INVENTOR5. Robe/f J. 56027 MW/am A. C/wpaefl Jack E. 5

3,313,493 Patented Apr. 11, 1967 3,313,493 ELECTREC ICE CRUSHER Robert J. Scott, Lake Tapawingo, and William A. Chappell, Raytown, Mo., and Jack E. Briar, Shawnee Mission, Kama, assignors to Rival Manufacturing Company, Kansas City Mo., a corporation of Missouri Filed Jan. 9, 1964, Ser. No. 336,725 13 Claims. (Cl. 241--36) This invention relates to ice crushing machines and refers more particularly to an improved domestic ice crusher of the electrically powered type.

One of the main objects of the invention is to provide an effective means by which a high speed, low torque electric motor can be utilized in an ice crusher. Such motors are well known to be much less expensive than low speed, high torque motors ordinarily employed in equipment of this type. However in the past their usage in ice crushers has been severely restricted because of the inability of the motor to consistently supply sufiicient power to achieve satisfactory crushing. By our arrangement, the motor power is aided sufiiciently by certain dynamic effects as to make possible highly effective crushing, either intermittent or continuous.

Another important object of the invention is to provide a domestic ice crusher in which the turning on and off of the motor is controlled through manual manipulation of an ice feed chute in such fashion that when the chute is closed, the motor is off and when open, the motor is turned on. A feature of the invention in this respect resides in the fact that the unit is so constructed that the normal condition of the machine is off and that whenever the chute is released, it automatically returns to its closed position and at the same time acts to de-energize the drive to the crushing mechanism.

A still further object of the invention is to provide a domestic ice crusher which is so constructed as to permit the continuous feeding of ice to the crushing mechanism while still protecting the operators fingers from accidental contact with the crushing elements. A related feature of the invention is the inclusion in the ice feed structure of a means operable to prevent chips of ice from being accidentally thrown back toward the operator.

Another object of the invention is to provide an improved rotor construction for ice crushers, which rotor structure has highly effective, long lasting crushing or breaking elements which differ in the material of which they are made from the remainder of the rotor structure yet are securely maintained in the proper operating relationship with one another and which has advantages over conventional rotors in first cost and maintenance.

Other and further objects of the invention, together with the features and novelty appurtenant thereto will appear in the course of the following description.

In the accompanying drawings which form a part of the specification and are to be read in conjunction therewith and in which like reference numerals indicate like parts in the various views;

FIG. 1 is a side elevational view of a preferred ice crusher embodying the invention, a portion of the outer casing side wall broken away for purposes of illustration;

FIG. 2 is a top plan view of same, the upper portion of the casing and movable ice feed chute partially broken away for purposes of illustration;

FIG. 3 is a side elevational view of same taken from the side opposite to that shown in FIG. 1, the outer casing having been completely removed to expose the interior mechanism;

FIG. 4 is a front elevational view, on a revised scale, of the preferred embodiment;

FIG. 5 is an enlarged side elevational view of a typical talon disassembled from the rotor;

FIG. 6 is a sectional view taken along line 6-6 01 FIG. 5 in the direction of the arrows;

FIG. 7 is a sectional view taken along line 77 01 FIG. 2 in the direction of the arrows;

FIG. 8 is an enlarged fragmentary sectional view taken along line 8--8 of FIG. 7 in the direction of the arrows;

FIG. 9 is an enlarged fragmentary sectional view taken along line 9-9 of FIG. 7 in the direction of the arrows;

FIG. 10 is an enlarged detailed showing of the impact clutch mechanism with certain component parts in exploded and open relationship;

FIG. 11 is a detailed showing of the biasing lever for the ice feed chute;

FIG. 12 is an enlarged fragmentary sectional View taken along line 1212 of FIG. 7 in the direction of the arrows;

FIG. 13 is an enlarged fragmentary sectional view taken along line 13-13 of FiG. 3 in the direction of the arrows;

FIG. 14 is an enlarged side elevation of the impact clutch mechanism, part -of the hub face broken away for purposes of illustration; and

FIG. 15 is a view similar to FIG. 14, but showing the rotation position of the parts at the time of driving impact between the drive gear and hub.

Referring now to the drawings, the preferred embodiment of the invention comprises a generally rectangular horizontal base 20 provided at its four corners with the support feet 21. The upper surface of the base is somewhat pan-like, having on two sides and the back a recessed edge flange 22 of substantial thickness as seen in FIGS. 1, 2 and 7. The top of the edge flange is grooved as at 22a to receive the lower rabbeted edge of the outer casing 23. Both the base member and the casing may be molded from conventional synthetic plastics.

The casing 23 is of generally rectangular box-like configuration and has the front wall 24, rear wall 25, top wall 26 and opposed parallel side walls 27. The top wall 26 is provided with a central opening running from the back toward the front, this opening having the parallel lengthwise side edges 28. The central opening extends into and down the rear wall 25, the lower edge being seen at 29 in FIGS. 1, 2 and 7. The forward end edge of the opening is formed by the upper edge 30 of the upright wall 31 of a cavity or pocket 32 molded in the front wall 24 of the casing. This pocket has the bottom wall 33.

Positioned within the above described central opening in the top wall of the casing is the elongate movable ice feed chute generally indicated by reference numeral 34. This is of inverted U-shape in transverse cross section, the top wall 34a forming the bight of the U and the parallel depending side walls 34b the legs thereof. The chute is pinned at its rearward end for pivotal movement about a fixed axis defined by pivot pin 35. The rearward end of the chute is closed by end wall 34c. The forward end of the chute is open with inturned flanges 34d defining the sides of the opening and a cross piece 34e extending between the side walls forming the lower side thereof. When the chute is pivoted toward the broken line position of FIG. 7, the cross piece 34:: serves as a limit stop by engaging and inturned lip 36 formed integrally with and extending inwardly from the upright wall 31 of the pocket in the front wall of the casing.

As will be observed, the forward end of the top wall 34a of the ice chute extends slightly beyond the end edges of the chute side walls to form a lip 34f which provides a convenient lifting surface for engagement by the finger tips. A gate member 37 is pivotally mounted within the chute near the forward end thereof. As seen in FIG. 13, the gate is substantially rectangular in shape.

The pivot mounting is effected through a V-shaped wire member 3Shaving the aligned, oppositely extending end portions 353a. These are received through apertured bosses 37:: on the gate and they extend on into registering apertures in the sidewalls of the chute in a rotatable fit.

The crushing mechanism is located within the main casing 23 and is supported by a casting having the front pair of corner legs 39 and rear pair of corner legs 4%). The legs are integral with and support a platform-like portion 41 having a central opening 42. This opening {017218 the lower end of an upwardly converging throat 43 having the front Wall 44, opposed rear wall 45 and opposed parallel side walis 46 (see FIG. 8). Upright ribs 46a may be formed on the side walls to provide reinforcement and to receive assembly fasteners at their upper ends, as will subsequently be seen.

The ends of legs 39, 46 are supported on the base member 29 and thus maintain the platform 41 at an elevated position providing clearance for an ice drawer 47. The drawer is insertable in and removable from the device through an appropriately sized opening in the lower part of the Fort wall of the casing. The drawer is of rectangular plan and has the front wall 47a which terminates at its upward edge in an out-turned undercut lip 47b. A depending lip portion 470 is provided at the lower edge of the front wall. This serves to engage the front end edge of the base member and limit the inward movement of the drawer to that desired.

Returning now to the throat section 43, disposed at the upper end thereof is a grid of spaced parallel bar members 48. The ends ofthe bars are respectively supported by projections 44a, 45a formed on the interior surfaces of the front and rear walls of the support. As best seen in FIG. 8, they rest in notches 49 cut in the respective projections.

Rising above the lower throat section 43 and forming an upward continuation thereof is an upper throat section 50 having the front wall 51, rear wall 52 and opposed parallel side walls 53. Like the lower throat section, the upper section is rectangular in cross section. Its lower end edge rests on the end portions of the bars 48 and it is secured in place by screws 54 which tighten ears 55 downwardly on the upper ends of the ribs 46a.

A plastic trough 56 having the inclined bottom wall 56a is secured as by screw 57 to the shortened front wall 51 of the throat 50. The forward end of the trough bottom is notched to interfit with the lip 36. The parallel side walls 56b of the trough are triangular in outline and form decreasing forward continuations of the sides 53 of the upper throat. It will be observed, particularly from FIG. 7, that a substantial portion of trough bottom 56 extends well into the throat. The purpose of this will be made clear at a later point herein.

Extending horizontally across throat 50 and journalled in appropriate bearings 58 formed in the side walls 53 thereof is a shaft 59 having secured thereto the taloned rotor 60. The shaft 59 terminates at one end in the lost motion clutch assembly 61 which includes the circumferentially toothed gear 62 and is later to be described in detail.

The rotor 60 is a specially constructed element having as its main body the hollow, generally tubular casting 60a which is sleeved over the shaft 59 and pinned centrally thereto by the drive pin 63. The talons 6011 are joined with the element 63a at the time of casting of the latter. The talons are typically shown, as they appear prior to the forming of the rotor, in FIG. 5. It will be noted that each includes a ring portion 600 having angularly spaced tabs 60d. The talons are placed in the mold (not shown) prior to pouring of the melt so that when the casting is cooled and removed, they are firmly imbedded as a part of the rotor structure. The tabs 60a assist in maintaining a secure rotary connection between the talons on casting. The structure makes it possible to have a relatively low-cost rotor which still has hard, good quality machined talons since the talons can be of stainless steel while the cast body 60a may be of lowcost casting metal.

It will be noted that the talons 6611 are so spaced longitudinaily of the rotor as to be able during rotation of the rote-r to move freely into and out of meshing relationship with the grid bars 43. Preferably, the talons also vary in length, a short one alternating with a long one. The ends of the talons are curved toward the direction of rotation of the rotor, which in FIG. 7 is clockwise.

Power is supplied to the rotor' from a high speed low torque electric induction type motor 63. The motor has a drive shaft 63a which terminates at one end in a small gear 64. Gear 64 drives the larger stage 65a of a two stage gear which includes also the smaller stage 65b. The

gear 651) in turn meshes with the gear 62 of the clutch assembly 61 earlier referred to. The end of motor shaft 63 opposite from the gear train has mounted thereon a relatively heavy fiy wheel 66 and the rotary fan blades 67. The fiy wheel is of the spoke type and the fan blades are pitched in a direction to cause air to be drawn inwardly through slots or openings 23a in the casing and passed through the fly wheel over the motor 63. Similar exhaust slots (not shown) are provided in the casing side wall on the other side so as to permit continued circulation of fresh air into the casing and over the motor, thereby to air cool same.

The clutch assembly 61 earlier adverted to includes a lost motion clutch arrangement which permits a substantial degree of rotation of gear 62 prior to the time that driving power is applied to the rotor shaft 59. As may best be seen in FIG. 10, gear 62 has a flat outer face 62a. Formed on the face is a substantially semi-circular outwardly projecting guide rib 62b and a similarly projecting arcuate boss 620 of about half the length of the rib. The boss carries at one end a rubber-like bumper element 68 and at its other end 62d is substantially radial with respect to the center of the gear. The gear is rotatably supported on shaft 59, i.e., it is capable of rotation independently of the shaft.

Cooperating with the gear 62 and arranged on the outer face thereof is the hub-like element 69. This element is dished to provide an inwardly concave central portion 69a and a shallower rim portion 69b. The central portion is apertured at 69c to press fit over the shaft 59 and is provided with radial key slots 69d adapted to receive the oppositely extending portions of a key pin 70 extending through and secured to the shaft. The hub element is provided with an arcuate lug 71 on its inside face; this can most conveniently be made by forming the wall of the hub with a cavity 71a open to the outside of the hub. The end walls 71b, 710 on the inside serve as radially oriented surfaces positioned to be engaged respectively by the bumper 68 and in surface 62a of the gear boss 620. A spring guide rib 72 forms a continuation of the peripheral face of the lug 7. and is positioned so as to lie inside but adjacent tbe rib 62b on the gear when the bumper is in contact with end 71b of the lug 71.

The normal position for the hub element relative to the gear is that illustrated in FIG. 14. The hub is biased to this position by a take-up spring 73 which is connected at one end to the hub as at 73a and at the other with the gear element as at 73b.

The on-off control for the motor comprises an electric switch mechanism 74 having a plunger 74a (FIGS. 2 and 13). The switch is connected in series with the motor and the operating plunger 74a is resiliently biased to the up position, a position which corresponds to the circuit closing or motor energizing condition of the switch. However, when the unit is not in operation, plunger 74a is depressed and thus held in the off position for the switch by a depressor 75 secured to the side wall 34b of the ice chute 34. The depresser 75 is preferably bent in a U-shape from a strip of spring metal and has the plunger contacting surface 75a.

The ice chute 34 is resiliently biased so that its forward end normally is in the down position (the position illustrated in FIGS. 1, 3 and 7 by the solid lines) by a spring and lever arrangement best understood from FIGS. 3 and 11. A lever arm 76 is pivotally connected at 7'7 with the side wall 3% of the ice chute on the gear train side. This lever has an offset portion which passes under the outer sleeve portion 53a of the rotor shaft hearing 58 on that side of the machine. At its rearward end it is connected with one end of a tension spring 78. Spring 78 has its other end fastened to an ear 79 depending from the support 8B for the pin 35. The support 8% is formed integral with and projects rearwardly from the rear wall 52 of the throat to the rotor.

it will be noted that the offset portion of the lever arm is provided with a curved stop 76:; adapted to conform with the curvature of the bearing sleeve 58a against which the lever is urged by the spring. The purpose of this is to insure that the lever will pivot rather than slide when the front end of the ice chute 34 is raised during operation.

In describing the operation of the preferred embodiment it will be understood that electrical energy is being supplied to the switch mechanism 74 by any conventional means, such as a cord plugged into a conventional wall socket (neither shown). The leads to the switch from the cord are illustrated at 81 and those between the switch and motor at 82. Posts 41a on platform 41 provide convenient wrapping guides for the cord and serve to guide it past and to hold it away from the gear train.

When it is desired to initiate ice crushing, the forward end of the ice chute 34 is lifted toward the broken line position of FIG. 7. While holding it in its position with one hand, ice cubes (not shown) are inserted into the open end of the chute as desired. The gate 37 will swing freely out of the way in response to the pressure of the cubes as successive cube-s are introduced. The lifting of the chute also serves to turn on the motor and thus, to transmit driving power through the gear train to the gear element 62. The turning on of the motor is caused by the lifting of the depresser 75 from depressing engagement with the upwardly biased switch plunger 74a.

It will be apparent that as long as there is no resistance imposed on the talons 60b, the hub element 69 will be rotated with gear 62 with the hub and gear in the relative solid line positions of FIG. 6. However, when a cube or chunk of ice is caught between one or more advancing talons and the grid bars 48, the talons become temporarily stationary due to the lost motion connection between the hub and the gear. The hub will remain stationary until the end face 71b of lug 71 moves on around to approach and strike against the end 62d of the boss 620, as shown in FIG. 15. At this occurs, the hub is directly drivingly connected with the gear and the talons will have imposed thereon a jarring impact which assists greatly in the breaking of the cubes.

It will be evident that as crushing proceeds and at any time resistance to rotation of the talons becomes less than the tension in the clutch take-up spring 73, the hub 69 will advance relative to the gear, thus preparing the talons for another impact stroke. The overrunning elfect provided by the lost motion connection, coupled with the reduction gearing between the motor and rotor and the provision of the heavy fly wheel all make it possible to obtain effective crushing with an inexpensive low torque, high speed motor. This is a distinct advantage in the present machine which, to our knowledge, does not appear in other machines of which we are aware.

The ice is crushed into particles small enough to pass downwardly between the bars 48 of the grid and will fall into the ice drawer 47, from which they can be removed therefrom by withdrawing and dumping the drawer. The overhanging portion of the trough bottom 56a serves to hold uncrushed chunks or cubes in position to be picked up by the talons and drawn around and downwardly onto the grid bars. The flying of chips back out of the unit through the ice chute is prevented by the gate 37 which, due ot its own weight and the pivotal suspension, automatically closes whenever cubes have passed thereby.

The unit is stopped by releasing the lifting pressure on the forward end of the ice chute. The spring 77 acting through lever arm 66 returns the ice chute to the normal down position. As it reaches this position, depressor again depresses the switch member 73a and the motor is shut off.

The relatively long ice passageway furnished by the movable ice chute is a valuable safety feature in that it ma es unlikely the accidential placing of the fingers in position to be struck by the talons. An additional safety factor is that the normal condition of the unit is ofi. Any release of the upward pressure on the ice chute results in the stopping of the machine and this too serves as an additional safety advantage.

From the foregoing description, it will be seen that this invention is one well adapted to attain all of the ends and objects hereinabove set forth together with other advantages which are obvious and which are inherent in the structure.

It will be understood that certain features and subcombinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of the claims.

Since many possible embodiments may be made of the invention without departing from the scope thereof, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Having thus described our invention, we claim:

1. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism mounted in said throat, electrically powered drive means for the crushing mechanism, an ice feed chute communicating with said throat, said chute including a movable wall portion, means mounting said movable wall portion for displacement between a first position in which the chute is substantially closed and a second position in which it is open for reception of ice, switch means for said drive means, and means associated with said chute and operable to actuate said switch means in response to movement of said movable wall portion between said first and second positions to energize said drive means when said movable wall portion is in said second position and deenergize said drive means when said movable wall portion is in said first position.

2. A domestic ice crusher comprising "a throat for passage of ice therethrough, crushing mechanism mounted in said throat and including a rotor with substantially radially projecting talons, an electric motor, means drivingly connecting said motor with said rotor, a variable cross section ice feed chute communicating with said throat and having a closed condition and an open condition, and control means for said motor connected with said chute and operable to start said motor in response to opening of said chute and stop same in response to closing said chute.

3. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism mounted in said throat and including a rotor with substantially radially projecting talons, an electric motor, means drivingly connectin said motor with said rotor, said means including mechanism providing a lost motion connection between said motor and rotor whereby to permit said motor to turn a predetermined amount independently of said rotor whenever said rotor is restrained by ice, a movable ice feed chute communicating with said throat, and

control means for said motor associated with said chute and operable to start and stop same in response to movement of said chute.

4. A domestic ice crusher as in claim 3 wherein said means drivingly connecting said motor with said rotor includes speed reduction means.

5. A domestic ice crusher as in claim 3 wherein said lost motion mechanism includes resilient means arranged to yieldably resist said lost motion.

6. A domestic ice crusher comprising an open top throat for passage of ice therethrough, a trough extending laterally toward and discharging into said throat, crushing mechanism mounted in said throat, electrically powered drive means connected with said crushing mechanism, a cover for said trough and forming with the trough a feed passageway to the throat, means mounting said cover for movement toward and away from said trough thereby to decrease and increase respectively the effective cross sectional area of said passageway, resilient means biasing said cover toward said trough, and control means for said drive means connected with said cover and operable to start said drive means in response to movement of said cover away from said trough and stop said drive means in response to movement of said cover back toward said trough.

7. A domestic ice crusher as in claim 6 wherein said control means includes an electrical switch.

3. A domestic ice crusher as in claim 6 wherein said control means includes a switch having an operating member normally in and biased toward the on position for the switch, and said cover carries means operable to displace said operating member on movement of the cover toward the trough and release it on movement away therefrom.

9. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism in said throat including a taloned rotor having a rotor shaft journal-led in the opposite side walls of said throat with one end of the shaft extending outside of the throat, a hub secured to said one end of said shaft, a gear member rotatably mounted on said shaft end portion adjacent said hub, cooperating means on said hub and gear member operable to provide a resiliently biased lost motion connection between said gear member and said hub, and power means drivingly connected with said gear member.

1%. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism in said throat including a taloned rotor having a rotor shaft journalled in the opposite side walls of said throat with one end of the shaft extending outside the throat, a hub secured to said one end of said shaft, a gear member rotatn-bly mounted on said shaft end portion adjacent said hub, cooperating means on said hub and gear member operable to provide a resiliently biased lost motion connection between said gear member and said hub, a high speed, low torque electric motor having an output shaft, a reduction gear train connected with said shaft and terminating in a gear meshing with said gear member, and a fly wheel on said output shaft.

11. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism in said throat including a taloned rotor having a rotor shaft journalled in the opposite side walls of said throat with one end of the shaft extending outside the throat, a hub secured to said one end of said shaft, a gear member rotatably mounted on said shaft and said shaft end portion adjacent said hub, one pair of inner engaging stop means on said hub and gear member respectively, resilient means normally holding said hub in a position wherein said one pair of stop means is engaged, a second pair of stop means on said hub and gear member respectively and operable to engage after limited rotation of said gear member relative to said hub member in a direction to separate said first pair of stop means, and power means drivingly connected with said gear member for driving same in said direction.

12. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism in said throat including a taloned rotor having a rotor shaft journalled in the opposite side Walls of said throat with one end of the shaft extending outside the throat, a hub secured to said one end of said shaft, a gear member rotatably mounted on said shaft end portion adjacent said hub, one pair of inner engaging stop means on said hub and gear member respectively, resilient means normally holding said hub in a position relative to said gear member wherein said one pair of stop means is engaged, a second pair of stop means on said hub and gear member respectively and arranged to engage after limited rotation of said gear member relative to said hub member in a direction to separate said first pair of stop means, a high speed, low torque electric motor having an output shaft, a reduction gear system connected with said shaft and terminating in a gear meshing with said gear member, and a fly wheel on said output shaft, said motor powered in a direction to turn said gear member in said direction.

13. A domestic ice crusher comprising a throat for passage of ice therethrough, crushing mechanism mounted in said throat and including a rotor with substantially radially projecting ta'lons, an electric motor, means drivingly connecting said motor with said rotor, said means including mechanism providing a lost motion connection between said motor and rotor whereby to permit said motor to turn a predetermined amount independently of said rotor whenever said rotor is restrained by ice, and control means operable to start and stop said motor.

References (Iited by the Examiner UNITED STATES PATENTS 2,217,568 10/1940 Shirley 241-36 2,558,255 6/1951 Johnson et al 24136 X 2,619,150 11/1952 Smith 24199 X 2,645,910 7/1953 Leeson 62--320 X 2,813,569 11/1957 Nelson.

3,010,662 11/1961 Johnson 24136 X \VILLTAM W. DYER, JR., Primary Examiner.

H. F. PEPPER, Assistant Examiner. 

1. A DOMESTIC ICE CRUSHER COMPRISING A THROAT FOR PASSAGE OF ICE THERETHROUGH, CRUSHING MECHANISM MOUNTED IN SAID THROAT, ELECTRICALLY POWERED DRIVE MEANS FOR THE CRUSHING MECHANISM, AN ICE FEED CHUTE COMMUNICATING WITH SAID THROAT, SAID CHUTE INCLUDING A MOVABLE WALL PORTION, MEANS MOUNTING SAID MOVABLE WALL PORTION FOR DISPLACEMENT BETWEEN A FIRST POSITION IN WHICH THE CHUTE IS SUBSTANTIALLY CLOSED AND A SECOND POSITION IN WHICH IT IS OPEN FOR RECEPTION OF ICE, SWITCH MEANS FOR SAID DRIVE MEANS, AND MEANS ASSOCIATED WITH SAID CHUTE AND OPERABLE TO ACTUATE SAID SWITCH MEANS IN RESPONSE TO MOVEMENT OF SAID MOVABLE WALL PORTION BETWEEN SAID FIRST AND SECOND POSITIONS TO ENERGIZE SAID DRIVE MEANS WHEN SAID MOVABLE WALL PORTION IS IN SAID SECOND POSITION AND DEENERGIZE SAID DRIVE MEANS WHEN SAID MOVABLE WALL PORTION IS IN SAID FIRST POSITION. 